挠性和晃动动力学模型解耦及局部迭代算法

Decoupling and Partial Iterative Calculation Method of Flexibility and Sloshing Dynamics

针对飞行器地面试验时由于模态阶数过高容易引起动力学运算发散的问题,提出将挠性振动及液体晃动模态和星体转动角加速度解耦,并采用局部迭代运算的方法减小迭代误差,从而避免了挠性和晃动动力学运算发散;解耦后的挠性和晃动动力学模型参数可以离线计算,减小了迭代计算量,降低了对计算机的性能要求,且易于工程实现。仿真验证表明解耦及迭代运算方法的有效性,计算速度可以提高1至2个数量级。

The spacecrafts that take advantage of flexible vibration and liquid sloshing modes can reach hundreds order. Dynamic is easy to diverge in the ground experiments of these spacecrafts. The measures of decoupling flexible vibration and liquid sloshing from body rotation and partial iterative calculation are applied to avoid no convergence of the flexibility and sloshing dynamics iterative operation because of iterative computing error. The parameters of flexibility and sloshing dynamics model which are decoupled can be calculated off line. The amount of calculation is decreased for the decoupled flexibility and sloshing dynamics model as parameters can be computed before the simulation. The method doesn’t need high-powered computer and is easy and applicable to engineering. The simulation result shows validation of the decoupling and the iterative operation. The calculation speed can be improved by one to two orders of magnitude.